Telegraph-sounder



2 Sheets-Sheet 1.

(No Model.)

J. MARET. TELEGRAPH SOUNDER.

,428. Patented Nov. 17,1891.-

Ya: Mama PETE! co., PNOTOHJTHQ, WASHINGTON, o. u,

(No Model.)

- 2 Sheets-Sl1eet 2. J. MARET.

TELEGRAPH SOUNDER.

Patented Nov. 17,1891.

lmllllllliill "m: no'nms warms co., Puma-mam, WASHINGTON, 0. c4

UNITED STATES PATENT OFFICE.

JAMES MARET, OF MOUNT VERNON, KENTUCKY.

TELEGRAPH-SOU NDER.

SPECIFICATION forming part of Letters Patent No. 463,428, dated November17, 1891.

Application filed February 3, 1891. Serial No, 380,026. (No model.)

The object of the invention is primarily to give great dist'inctness ofsound and at the same time to simplify the means of adjustment andcheapen its construction; and to this end it consists, essentially, inconcentrating the attractive power ofan electro-magnet centrally, sothat its direct influence is exerted upon the armature, the armatureitself in its movement acting as a hammer or striker to .produce soundby actual contact with the points forming the limits of its movement,the poles of the magnet serving as vibratoryarms and being brought intothe points of contact of the armature.

I have illustrated my invention in the accompanying drawings, in whichFigure 1 represents a perspective View of a sounder constructed inaccordance with my invention. Fig. 2 is a Vertical longitudinalsectional View of the same, taken centrally through the electro -magnet.Fig. 3 is a cross-section of a modified form of sounder, and Fig. 4 is alongitudinal section of the same.

A represents awooden base, to which is secured the brass base-plate B,both of ordinary construction and common to the wellknown Sounders ingeneral use. Upon this base-plate is mounted the electro-magnet 0,consisting of the helices c 0, their cores 0 being connected at theirlower ends by the soft-iron'bar 0 as usual. To the upper end of eachcore is rigidly secured abarc c each extending inward until its endnearly meets at a point midway between the helices. Thus although thecoils themselves are widely separated the poles of the magnet arebrought into close relation to each other and the power of the magnetconcentrated at a central point. The inner end of each of theseextensions is increased in size by the addition of a semicircular pieceof iron 0 secured thereto or formed integral therewith, placed end toend, yet out of contact, together assuming the shape of a severed disk.The arms, being thus secured at their outer ends and free at their innerends, are capable of slight vibratory movement.

Midway between the helices and rising from the base-plate is a'bracketorstandard D, in which is mounted a brass rod 6, carrying at its lowerend an armature E, of soft iron, preferably circular in form, and whichis arranged directly above the disk-shaped ends of the poles of themagnet. This armature is surrounded by a brass rim or band 6. The rod 6is capable of easy vertical movement to admit of the rise and fall ofthe armature, owing to the magnetization or demagnetization of the polesbeneath. The return of the armature to its normal position duringdemagnetization or when the circuit is broken is insured through theaction of a spring 6 encircling the rod, its tension being regulated byjam-nut 6 against which its upper end bears. The bearing of the rod isformed by an encircling sleeve F, threaded upon it outer side andprovided with a thumb-piece f, the sleeve passing through a threadedopening in the standard and adapted to be brought to bear against theupper surface of the soft-iron armature to limit its upward movement andincrease or decrease the distance between the magnet and thestrikingarmature, as may be necessary. A jam-nut f confines the sleeveand holds it to its proper adjustment.

Centrally beneath the poles of the magnet is mounted in the bracket anadjusting-screw G, the end of which extends upward between the poles andconstitutes the lower point or limit of movement of the armature, itspoint being adjusted to extend sufliciently above the face of the polesto prevent contactof the armature therewith; Thusit will be seen thatthe poles of the magnet encircle the lower stop, being suspendedthereabout, as it were. By means of these adjustable points or stops thelimit of movement of the striking armature or hammer can be definitelydetermined and fixed and from time to time adjusted at once andeffectively to suit the strength of the current.

lVhile I have shown the vibrating poles extended directly toward eachother, I do not wish to confine myself to this form of construction,since it is obvious that a more compact instrument may be made bydropping the extended poles of the magnet below the level of thehelices, any side attraction being prevented by the brass rim or bandthereon. It is also obvious that the striking armature or hammer may beplaced beneath the poles with equal advantage, the opposing stop beingthen located above and the order of movement reversed. These are merevariations coming within the limit of my invention.

The advantage of this instrument over those formerly known and used isapparent. The entire magnetic power of attraction is concentrated at onepoint and exerted directly upon the soun d-producin g striker or hammeritself, thus utilizing the attraction to its greatest extent.

It is obvious that my invention may be applied with equal success totelegraph-relays.

That I claim as new, and desire to secure by Letters Patent, is-

1. In a telegraph-sounder, the combination of an electro-magnet havingthe poles bent or turned toward each other, a bracket or standard, anadjustable contact-screw in the standard passing between the inner endsof the poles, a striking-armature in the standard, a sleeve adjustablein the bracket, a jam-nut, and spring for said striking-armature.

2. In a telegraphsounder, the combination of a base-plate, anelectro-magnet mounted thereon having the poles bent or turned towardeach other, a bracket mounted on the base-plate and having cross-piecesabove and below the poles of the magnet, an adjustable contact-pointarranged in the lower crosspieces between the poles, an adjustablehammer-armature carried by the upper crosspiece, and a spring forreturning thesaid armature, as set forth.

3. In a telegraph-sounder, the combination of a base, a standard risingtherefrom, electro-magnets mounted on the base and having their polesbent or turned inward, an adjustable contact-point arranged between theends I of the poles, and an armature having an enlarged head or hammerfor striking said contact-point.

4. In a telegraph-sounder, the combination of a base, a standard risingtherefrom having cross-pieces, an eleotro-magnet on the base having thepoles bent or turned inward, a contact-point arranged in one of thecross-pieces of the standard between the ends of the poles, atstriking-armature arranged in the other cross-piece, and areturning-spring for the armature.

In testimony whereof I aflix my signature in presence of two witnesses.

LAKES MARE'I. \Vitnesses:

HUGH MILLER, J. M. BROWN.

